Weight adjustable dumbbell and using method thereof

ABSTRACT

A weight adjustable dumbbell, which includes a connecting bar and a supporting base. Two sides of the supporting base are has a receiving groove, respectively. A plurality of dumbbell plates opposite to each other are located in the receiving grooves along an axial direction, a notch is located on each of the dumbbell plates for inserting the connecting bar, a slot opposite to the connecting bar is defined on an inner wall of the notch, fasteners opposite to the dumbbell plates are set on the connecting bar along the axial direction, the fasteners at an end of the connecting bar are arranged spirally along the axial direction at equal angles. The plurality of fasteners can connect to the slot of the dumbbell plates sequentially by rotating the connecting bar, and the dumbbell plates are detachably connected to limiting parts that can limit the rotation of the connecting bar.

TECHNICAL FIELD

The present disclosure relates to a physical exercise equipment, and particularly to a weight adjustable dumbbell.

BACKGROUND

A dumbbell is a simple equipment for strengthening muscle strength training, which is mainly made of cast iron. A conventional dumbbell can be a weight-fixed type or a weight adjustable type. The weight of a weight-fixed dumbbell is unchangeable, and the dumbbell is usually cast according to a required weight, and sometimes a rubber cover for dampness is set one the outer surface of the dumbbell. An adjustable dumbbell can adjust its weight, which includes a connecting bar and a plurality of dumbbell plates, both ends of the connecting bar has a threaded part and a limiting block, and the threaded part is extending to the end tip of the connecting bar. Therefore, the weight of the dumbbell can be adjusted by equally inserting dumbbell plates of required numbers at both ends of the connecting bar according to the requirement of weight. Also, due to the consideration of security, the threaded part of the weight adjustable dumbbell is connected to a limiting disk, so as to prevent the dumbbell plates from falling from the connecting bar.

For a conventional weight adjustable dumbbell, generally the detached dumbbell plates are stored on racks, while in use, required numbers of dumbbell plates are taken and sequentially mounted on the connecting bar, then limiting disks are mounted on both ends of the connecting bar, forming the overall structure of a dumbbell. While this kind of operation may cause difficulty in handling. In prior arts, the required numbers of dumbbell plates on the rack cannot be directly mounted on the connecting bar while the dumbbell plates are still stored on the rack, so as to reduce handling and is convenient to operate.

SUMMARY

In order to overcome the deficiencies of the prior art, the present disclosure is aimed to provide a weight adjustable dumbbell and a method of using thereof, such that the required numbers of dumbbell plates can be directly mounted on the connecting bar, so as to reduce handling and is convenient to operate.

The technical purpose of the present disclosure can be solved by the following technical solutions:

A weight adjustable dumbbell, which includes a connecting bar and a supporting base. Two sides of a top surface of the supporting base are defined with a receiving groove, respectively. A plurality of dumbbell plates opposite to each other are provided in the receiving grooves along an axial direction, a notch is defined on each of the dumbbell plates capable to inserting the connecting bar, a slot opposite to the connecting bar is defined on an inner wall of the notch, a plurality of fasteners opposite to the dumbbell plates are provided on the connecting bar along the axial direction, the fasteners at an end of the connecting bar are arranged spirally along the axial direction, and are arranged at equal angles about the axis of the connecting bar. The plurality of fasteners can connect to the slot of the dumbbell plates sequentially by rotating the connecting bar, and the dumbbell plates are detachably connected to limiting parts that can limit the rotation of the connecting bar.

Additionally, the notch has a shape of stripe, and the notch is extending to a center of the dumbbell plate, notches of the dumbbell plates of the same side are aligned with each other. The cross-sectional shape of the notch perpendicular to the dumbbell plate is arc shaped, the slot has an arc shaped opening facing to the notch, and an arc of the slot has a radius of curvature as same as the radius of the connecting bar, and the axis of the connecting bar is arranged co-axially with the inner circumferential surface of the slot, each of the fasteners includes a flat groove defined at a outer circumferential surface of the connecting bar, the flat groove is extending along the axis of the connecting bar to an end surface facing a middle part of the connecting bar of a dumbbell plate nearest to the middle part of the connecting bar. The flat grooves of fasteners at the same end are in communication with each other, the outer circumferential surface of the connecting bar facing the dumbbell plates forms connecting parts with openings of the flat grooves, the connecting parts are capable of fastening to the slots, and the connecting parts of the connecting bar depart from the inner walls of the slots while the flat grooves are facing the slots.

Additionally, the angle of two ends of the slot along the arc direction with respect to the center thereof is equal to an angle of two edges of the flat groove along the circumferential direction of the connecting bar about the axis thereof, and a product of the angle of two edges of the flat groove along the circumferential direction of the connecting bar about the axis thereof and a number of the dumbbell plates at the same side is less than 360 degree.

Additionally, the slots facing each other of the dumbbell plates at the same side forms a inserting groove, both ends of the connecting bar are rotatably connected to a hollow inserting plate inserted to inserting groove, a thin wall of the hollow inserting plate has elasticity and toughness, all of the flat grooves at the same side of the connecting bar are provided in the hollow inserting plate, and a stopper detachably connected to the supporting base is provided on the hollow inserting plate.

Additionally, both axial end of the hollow inserting plate along the connecting bar are connected to a hollow cover, and the connecting bar is rotatably connected to the hollow covers.

Additionally, the stopper includes a limiting disk connected to the hollow inserting plate, a plurality of limiting notches are defined on a peripheral of the limiting disk, and a positioning block capable of inserting into the positioning notches is extruded from the top surface of the supporting base.

Additionally, a mounting groove is defined on the end surface of the hollow inserting plate away from the inserting groove, a plurality of through holes corresponding to the dumbbell plates are defined on an inner bottom surface of the mounting groove, a main magnet plate is fixed to the inner bottom surface of the mounting groove, and a plurality of straight holes corresponding to the plurality of through holes are extended through the main magnet plate; the limiting part comprises a mounting plate inserting to the mounting groove, and a plurality of connecting grooves corresponding to the through holes are defined on an end face of the mounting plate facing the inner bottom surface of the mounting groove, the end face of the mounting plate facing the inner bottom surface of the mounting groove is fixed to a sub magnet plate, a plurality of through grooves corresponding to the connecting grooves are extended through the sub magnet plate, a spring is fixed on the inner bottom surface of each of the connecting grooves, and an abutting block is fixed to an end of the spring away from the mounting plate, and the abutting block and the spring are both extending through the straight hole and the through hole. The abutting block is firmly abutted to at least one of the flat grooves via the spring while the connecting bar is fastened into the slots by the connecting parts.

Additionally, a plurality of threaded holes in communication with the plurality of connecting grooves are extending through the mounting plate, each of the threaded holes is connected with a threaded rod, and the threaded rod is extending through the spring and abuts to the abutting block.

Additionally, a plurality of separating grooves for inserting the dumbbell plates are defined on the receiving groove of the supporting base arranged along the axial direction, a peripheral surface of each of dumbbell plates is provided with a section, and the dumbbell plates abut to an inner bottom surface of each of the separating grooves by the sections.

A method of using a weight adjustable dumbbell is also provided, which includes following steps:

step 1: placing the plurality of dumbbell plates into the separating grooves of the supporting base, abutting to the inner bottom surface of the separating grooves via the sections of the dumbbell plates, the notches are all upward placed, and all of the slots of the adjacent dumbbell plates are aligned with each other, then inserting the hollow inserting plates on both ends of the connecting bar into the inserting groove formed by the slots of the plurality of dumbbell plates at the same side, at the same time, inserting positioning blocks of the supporting base into the limiting notches of the limiting disk;

step 2: remaining the hollow inserting plate, the dumbbell plates, and the supporting base in a relatively stable state, then rotating the connecting bar, such that the plurality of connecting parts sequentially inserting into the thin walls of the hollow inserting plate and fastening into the slots, then stop rotating the connecting bar if the required number of the fastened dumbbell plates is reached; and

step 3: inserting the plurality of abutting blocks and the springs into the through holes, and the sub magnet plate of the mounting plate is attaching to the main magnet plate in the inner bottom surface of the mounting groove, wherein the abutting blocks at one end of the connecting bar firmly abut to at least one flat grooves via the springs, then connecting the threaded rods to the threaded holes, the threaded rods abutting to the abutting blocks after extending the springs, thereby limiting the movement of the abutting blocks.

Accordingly, the present disclosure has the following beneficial effects:

Since two sides of a top surface of the supporting base both has receiving grooves, a plurality of dumbbell plates opposite to each other can be placed, and by equally placing the dumbbell plates in the receiving grooves corresponding to the both ends of the connecting bar at both ends of the supporting base, the dumbbell plates can be directly mounted to the two ends of the connecting bar. Since the dumbbell plate has a notch, and the notch has slot inside, by aligning the notches and slots of the dumbbell plates at the same time, the both ends of the connecting bar can be inserted into the notches of the dumbbell plates at both ends simultaneously, and the connecting bar is opposite to the slots of the dumbbell plates. Since a plurality of fasteners opposite to the dumbbell plates are set on the connecting bar along the axial direction and are arranged at equal angles about the axis of the connecting bar, while rotating the connecting bar, the fasteners at the same side of the connecting bar can engage with the dumbbell plates one by one, such that the fasteners can be fastened into the slots of the dumbbell plates one by one, therefore, the numbers of the dumbbell plates fastened to the fasteners on the connecting bar can be adjusted by controlling the angle of rotation, further adjusting the weight of the dumbbell. Additionally, the limiting parts detachably connected to the dumbbell can limit the rotation of the connecting bar. Thus, when the number of dumbbell plates fastened to the fasteners reaches the required number, the limiting parts can be mounted to the dumbbell plates, so as to limit the rotation of the connecting bar, such that the department between the fasteners and the slots due to an over-rotation of the connecting bar is avoided, thereby improving the overall stability of the structure of the technical solution. To sum up, the user can place the dumbbell plates on the supporting base, then directly mount the required numbers of dumbbell plates by rotating the connecting bar, so as to reduce handling and is convenient to operate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the present disclosure;

FIG. 2 is an explosive view of the present disclosure;

FIG. 3 is a perspective view of the supporting base connected to the limiting disks of the present disclosure;

FIG. 4 is a perspective view of the dumbbell in a lifted state of the present disclosure;

FIG. 5 is an alternative perspective view of the dumbbell in a lifted state of the present disclosure;

FIG. 6 is a perspective view of the connecting bar of the present disclosure;

FIG. 7 is a perspective view of the hollow inserting plate and the hollow cover of the present disclosure;

FIG. 8 is a perspective view of the mounting plate of the present disclosure;

FIG. 9 is an alternative perspective view of the mounting plate of the present disclosure;

FIG. 10 is a perspective view of the connecting bar detached to all of the dumbbell plates of the present disclosure;

FIG. 11 is a perspective view of the connecting bar while one dumbbell plate is fastened to each side of the connecting bar of the present disclosure;

FIG. 12 is a perspective view of the connecting bar while two dumbbell plates are fastened to each side of the connecting bar of the present disclosure;

FIG. 13 is a perspective view of the connecting bar while three dumbbell plates are fastened to each side of the connecting bar of the present disclosure; and

FIG. 14 is a perspective view of the connecting bar while all dumbbell plates are fastened to each side of the connecting bar of the present disclosure.

REFERENCE NUMBER

1. supporting base; 11. receiving groove; 12. separating groove; 13. positioning block; 2. dumbbell plate; 21. notch; 22. slot; 23. inserting groove; 24. section; 3. connecting bar; 31. flat groove; 32. connecting part; 33. anti-slip rubber cover; 34. limiting disk; 341. positioning notch; 4. hollow inserting plate; 41. hollow cover; 42. mounting groove; 43. through hole; 5. mounting plate; 51. connecting groove; 52 sub magnet plate; 53. spring; 54 abutting block; 55. threaded hole; 56. threaded rod; 561 hexagonal counterbore.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure will be further described in detail below with reference to the drawings. The terms “upper”, “inner”, “center”, “left”, “right”, and “one” cited in this specification are only for ease of description and are not intended to limit the scope of the present disclosure. The change or adjustment of the relative relationship of the elements, without substantial changes to the technical content, shall also be regarded as the scope within which the present disclosure can be implemented.

Referring to FIG. 1 to FIG. 9, a weight adjustable dumbbell includes a connecting bar 3 and a supporting base 1, and two sides of the top surface of the supporting base 1 have a receiving groove 11, respectively. A plurality of dumbbell plates 2 opposite to each other are provided in the receiving grooves 11 along an axial direction, and four dumbbell plates 2 are shown in the illustrated embodiment. A notch 21 is defined each of the dumbbell plates 2 for inserting the connecting bar 1, a slot 11 opposite to the connecting bar 2 is defined on an inner wall of the notch 21, a plurality of fasteners opposite to the four dumbbell plates 2 are provided on the connecting bar 3 along the axial direction, the fasteners at an end of the connecting bar 3 are arranged spirally along the axial direction, and are arranged at equal angles about the axis of the connecting bar 3. The plurality of fasteners can connect to the slots 22 of four the dumbbell plates 2 sequentially by rotating the connecting bar 3, and the dumbbell plates 2 are detachably connected to limiting parts that can limit the rotation of the connecting bar 3.

Specifically, since two sides of the top surface of the supporting base 1 both has receiving grooves 11, a plurality of dumbbell plates 2 opposite to each other can be placed, and by equally placing the dumbbell plates 2 in the receiving grooves 11 corresponding to the both ends of the connecting bar 3 at both ends of the supporting base 1, the dumbbell plates 2 can be directly mounted to the two ends of the connecting bar 3. Since the dumbbell plate 2 has a notch 21, and the notch 21 has slot 22 inside, by aligning the notches 2 and slots 22 of the dumbbell plates 2 at the same time, the both ends of the connecting bar 3 can be inserted into the notches 2 of the dumbbell plates 2 at both ends simultaneously, and the connecting bar 3 is opposite to the slots 2 of the dumbbell plates 2. Since a plurality of fasteners opposite to the dumbbell plates 2 are set on the connecting bar 3 along the axial direction and are arranged at equal angles about the axis of the connecting bar 3, while rotating the connecting bar 3, the fasteners at the same side of the connecting bar 3 can engage with the dumbbell plates 2 one by one, such that the fasteners can be fastened into the slots 22 of the dumbbell plates 2 one by one, therefore, the numbers of the dumbbell plates 2 fastened to the fasteners on the connecting bar 3 can be adjusted by controlling the angle of rotation, further adjusting the weight of the dumbbell. Additionally, the limiting parts detachably connected to the dumbbell can limit the rotation of the connecting bar 3. Thus, when the number of dumbbell plates 2 fastened to the fasteners reaches the required number, the limiting parts can be mounted to the dumbbell plates 2, so as to limit the rotation of the connecting bar 3, such that the department between the fasteners and the slots 22 due to an over-rotation of the connecting bar is avoided, thereby improving the overall stability of the structure of the illustrated embodiment. To sum up, the user can place the dumbbell plates 2 on the supporting base 1, then directly mount the required numbers of dumbbell plates 2 by rotating the connecting bar 3, so as to reduce handling and is convenient to operate.

Referring to FIG. 1 to FIG. 14, so as to achieve the engagement between the fasteners and the slots on the dumbbell plates 2: The notch 21 has a shape of stripe, and the notch 21 is extending to a center of the dumbbell plate 2, notches 21 of the four dumbbell plates 2 of the same side are aligned with each other. The cross-sectional shape of the notch 21 perpendicular to the dumbbell plate 2 is arc shaped, the slot 22 has an arc shaped opening facing to the notch 21, and an arc of the slot 22 has a radius of curvature as same as the radius of the connecting bar 3, and the axis of the connecting bar 3 is arranged co-axially with the inner circumferential surface of the slot 22, each of the fasteners includes a flat groove 31 defined at a outer circumferential surface of the connecting bar 3, the flat groove 31 is extending along the axis of the connecting bar 3 to an end surface facing a middle part of the connecting bar 3 of a dumbbell plate 2 nearest to the middle part of the connecting bar 3. The flat grooves 31 of fasteners at the same end are in communication with each other, the outer circumferential surface of the connecting bar 3 facing the dumbbell plates 2 forms connecting parts 32 with openings of the flat grooves 31, the connecting parts 32 are capable of fastening to the slots 22, and the connecting parts 32 of the connecting bar 3 depart from the inner walls of the slots 22 while the flat grooves 31 are facing the slots 22.

Specifically, during the flat grooves 31 are gradually facing the slots 22 of the dumbbell plates 2, the connecting parts 32 of the connecting bar 3 depart from the corresponding slot 2 of the dumbbell plate 2, such that the fastener departs from the slot 22. Also, since the dumbbell plates 2 are arranged along the axial direction, and the slots 22 and the notches 21 of adjacent dumbbell plates 2 are aligned with each other, so as to ensure that the connecting parts 32 of the connecting bar 3 can be fastened to the corresponding slots 22 sequentially by rotating the connecting bar 3 while the slots 22 not opposite to the connecting parts 32 don't fasten to the connecting parts 32, flat grooves 31 are set on the outer surface of the connecting bar 3, and the flat grooves 31 are extending to the outer surface of the dumbbell plate 2 nearest to the middle of the connecting bar 3. Thus, the mounting order of the dumbbell plates 2 at the same side can be defined as sequentially mounting from the outer part to the inner part. More specifically, if the flat groove 31 corresponding to the outermost dumbbell plate 2 is opposite to the slot 22, all of the slots 22 cannot be fastened to the connecting parts 32. Similarly, if the flat groove 31 corresponding to the dumbbell plate 2 in the middlemost of the connecting bar 3 is opposite to the slot 22, only the slot 22 in the middlemost of the connecting bar 3 cannot be fastened to the corresponding connecting part 32. It can be seen that, by setting the flat grooves 31 along the spiral direction, and by controlling the length of the flat grooves 31 extending in the axial direction, the number of departing the connecting parts 32 and the flat grooves 31 is controlled. In other words, the number of the connecting parts 32 and the slots 22 engaged can be controlled.

So as to control the depth of the flat grooves 31, so as to prevent the situation that the outer surface of the connecting bar 3 corresponding to the dumbbell plate 2 at the most middle part thereof cannot form a connecting part 32 between the corresponding float 31: the angle of two ends of the slot 22 along the arc direction with respect to the center thereof is equal to an angle of two edges of the flat groove 31 along the circumferential direction of the connecting bar 3 about the axis thereof, in the illustrated embodiment, angle of two edges of the flat groove 31 along the circumferential direction of the connecting bar 3 about the axis thereof is 72 degree. And a product of the angle of two edges of the flat groove 31 along the circumferential direction of the connecting bar 3 about the axis thereof and the number of the dumbbell plates 2, which is 2 in the illustrated embodiment, at the same side is less than 360 degree. Specifically, since the arc of the slot 22 is co-axially set to the connecting bar 3, by limiting the angle degrees of the arc of the slot 22 and the flat groove 31 corresponding to the connecting bar 3, the plurality of flat grooves 31 on the connecting bar 3 have equal angles, such that each of the connecting part 32 can be engaged with a slot 22 by rotating the same angle. Additionally, since the product of the angle of two edges of the flat groove 31 along the circumferential direction of the connecting bar 3 about the axis thereof and the number of the dumbbell plates 2, which is 2 in the illustrated embodiment, at the same side is less than 360 degree, the depth of the flat grooves 31 is controlled, so as to prevent the situation that the outer surface of the connecting bar 3 corresponding to the dumbbell plate 2 at the most middle part thereof cannot form a connecting part 32 between the corresponding float 31 if the flat grooves 31 is too deep. So as to achieve the beneficial effect of improving the overall structure, using scientifically, and precise calculation constraints.

Referring to FIG. 1 to FIG. 14, since the dumbbell plates 2 are received in the receiving groove 11 of the supporting base 1, so as to prevent the dumbbell plate 2 be driven to rotate with the rotation of the connecting bar 3 and causing mismatch: The slots 21 facing each other of the four dumbbell plates 2 at the same side forms a inserting groove 23, both ends of the connecting bar 3 are rotatably connected to a hollow inserting plate 4 inserted to inserting groove 23, a thin wall of the hollow inserting plate 4 has elasticity and toughness, all of the four flat grooves 31 at the same side of the connecting bar 3 are located in the hollow inserting plate 4, and a stopper detachably connected to the supporting base 1 is connected to the hollow inserting plate 4.

Specifically, since the connecting bar 3 are rotatably connected to the hollow inserting plate 4 inserted to inserting groove 23, and a stopper is connected to the hollow inserting plate 4, the stopper is detachably connected to the supporting base 1, such that the rotation of the hollow inserting plate 4 and the dumbbell plates 2 and the mismatch is limited, further improving the effectiveness of the rotation of the connecting bar. Since the thin wall of the hollow inserting plate 4 has elasticity and toughness, while the connecting parts 32 are engaging to the slots 22 in the rotation of the connecting bar 3, the connecting parts 32 insert into the thin walls of the hollow inserting plate 4 and co-axially fasten into the corresponding slots 23. Also, the thin wall of the hollow inserting plate 4 can increase the friction between the connecting parts 32 and the slots 23, preventing the connecting parts 32 departing from the slots 23.

In order to further prevent the dumbbell plates 2 axially falling from the connecting bar 3, both axial end of the hollow inserting plate 4 along the connecting bar 3 are connected to a hollow cover 41, and the hollow cover 41 is in communication with the hollow inserting plate 4, such that the hollow inserting plate 4 forms an integrated structure, which can be processed through extrusion and injection molding processes, thereby realizing the convenience of processing.

Referring to FIG. 1 to FIG. 14, so as to achieve the detachable connection between the stopper and the mounting base: the stopper includes a limiting disk 34 connected to the hollow inserting plate 4, and the limiting disk 34 is coaxial to the connecting bar. A plurality of limiting notches 341 are arranged around the peripheral direction of the limiting disk 34 at equal angles, and a positioning block 13 for inserting into the positioning notches 341 is extruded from the top surface of the supporting base 1. Therefore, to adjust the number of the dumbbell plates 2, the limiting notches 341 on the limiting disk 341 can be engaged with the positioning block 13, so as to limit the dumbbell plates 2 in a relatively fixed state with the supporting base 1.

Additionally, a mounting groove 42 is defined on the end surface of the hollow inserting plate 4 away from the inserting groove 23, four through holes 43 corresponding to four the dumbbell plates 2 are defined on an inner bottom surface of the mounting groove 42. A main magnet plate (not shown) is fixed to the inner bottom surface of the mounting groove 42, and four straight holes (not shown) corresponding to the four through holes 43 are extended through the main magnet plate. The limiting part includes a mounting plate 5 inserting to the mounting groove 42, and four connecting grooves 51 corresponding to the four through holes 43 are defined on the end face of the mounting plate 5 facing the inner bottom surface of the mounting groove 42, the end face of the mounting plate 5 facing the inner bottom surface of the mounting groove 42 is fixed to a sub magnet plate 52, and four through grooves (not shown) corresponding to the connecting grooves 51 are extended through the sub magnet plate 52. A spring 53 is fixed on the inner bottom surface of each of the connecting grooves 51, and an abutting block 54 is fixed to the end of the spring 53 away from the mounting plate 5, the abutting block 54 can be a steel post or a steel bead, and the abutting block 54 and the spring 53 are both extending through the straight hole and the through hole 43. The abutting block 54 is firmly abutted to at least one of the flat grooves 31 by the spring 53 while the connecting bar 3 is fastened into the slots by the connecting parts 32.

Specifically, if one flat groove 31 is facing one through hole 43, the connecting part 43 corresponding to the flat groove 31 may still partly engage with the slot 22, which means, this dumbbell plates 2 can still be fixed to the connecting bar 3 at least if part surface of the connecting part 32 is abutting to the inner wall of the slot 22. Therefore, during operation, the flat groove 31 of the dumbbell plate 2 required to be mounted is facing the through hole 43, and the connecting part 32 corresponding to this flat groove 31 is engaged with the slot 22 of this dumbbell plate 2, the mounting plate 5 is attached to the main magnet plate by the sub magnet plate, then the mounting plate 5 is inserted into the mounting groove 42, at the same time the four springs 53 and abutting blocks 54 are extending the four through holes. With the attachment between the main magnet plate and the sub magnet plate 52, the abutting blocks 54 are abutting to the surface of the connecting bar 3 by the pusing of the springs 53, and at least one abutting block is abutting the inner wall of one of the flat grooves 31, so as to limit the rotation of the connecting bar 3.

Referring to FIG. 1 to FIG. 14, to further limit the rotation of the connecting bar 3 by the abutting blocks 54, a plurality of threaded holes 55 in communication with the plurality of connecting grooves 51 are extending through the mounting plate 5, each of the threaded holes 53 is connected with a threaded rod 56, the threaded rod 56 has a hexagonal counterbore 561 at one end, and the threaded rod 56 is extending through the spring 53 and abuts to the abutting block 54, thereby further limiting the rotation of the connecting bar 3.

In order to stably place the dumbbell plates 2 into the receiving groove 11 and keep a stable state, a plurality of separating grooves 12 for inserting the dumbbell plates 2 are defined on the receiving groove 11 of the supporting base 1 arranged along the axial direction, a peripheral surface of each of dumbbell plates 2 is provided with a section 24, and the dumbbell plates 2 abut to the inner bottom surface of each of the separating grooves 12 by the sections 24.

An anti-slip rubber cover 33 is fixed to the surface of the connecting bar 3 between the two limiting disks 34, so as to increase the friction of the surface of the connecting bar 3 for a better gripping.

A method of using a weight adjustable dumbbell is also provided, which includes following steps:

step 1: placing the plurality of dumbbell plates 2 into the separating grooves 12 of the supporting base 1, abutting to the inner bottom surface of the separating grooves 12 by the sections 24 of the dumbbell plates 2, the notches 21 are all upward placed, and all of the slots 22 of the adjacent dumbbell plates 2 are aligned with each other, then inserting the hollow inserting plates 4 on both ends of the connecting bar 3 into the inserting grooves 23 formed by the slots 22 of the plurality of dumbbell plates 2 at the same side, at the same time, inserting the positioning blocks 13 of the supporting base 1 into the limiting notches 431 of the limiting disk 34;

step 2: remaining the hollow inserting plate 4, the dumbbell plates 2, and the supporting base 1 in a relatively stable state, then rotating the connecting bar 3, such that the plurality of connecting parts 32 sequentially inserting into the thin walls of the hollow inserting plate 4 and fastening into the slots 22, then stop rotating the connecting bar 3 if the required number of the fastened dumbbell plates 2 is reached; and

step 3: inserting the plurality of abutting blocks 54 and the springs 53 into the through holes 43, and the sub magnet plate 52 of the mounting plate 5 is attaching to the main magnet plate in the inner bottom surface of the mounting groove 42, wherein the abutting blocks 54 at one end of the connecting bar 3 firmly abut to at least one flat grooves 31 by the springs 53, then connecting the threaded rods 56 to the threaded holes 55, the threaded rods 56 abutting to the abutting blocks 54 after extending the springs 53, thereby limiting the movement of the abutting blocks 54.

By taking the above-mentioned method, the user can place the dumbbell plates 2 on the supporting base 1, then directly mount the required numbers of dumbbell plates 2 by rotating the connecting bar 3, so as to reduce handling and is convenient to operate.

The detailed embodiments are merely an explanation of the present disclosure, but not a limitation. And those skilled in the art may, after reading the specification, make modifications to the embodiments as necessary without contributing to the inventive step, provided that they are protected by patent law within the scope of the claims. 

What is claimed is:
 1. A weight adjustable dumbbell, comprising a connecting bar and a supporting base, wherein two sides of a top surface of the supporting base are defined with a receiving groove, respectively, a plurality of dumbbell plates opposite to each other are provided in the receiving grooves along an axial direction, a notch is defined on each of the dumbbell plates capable to inserting the connecting bar, a slot opposite to the connecting bar is defined on an inner wall of the notch, a plurality of fasteners opposite to the dumbbell plates are provided on the connecting bar along the axial direction, the fasteners at an end of the connecting bar are arranged spirally along the axial direction, and are arranged at equal angles about the axis of the connecting bar, the plurality of fasteners are capable of connecting to the slot of the dumbbell plates sequentially via rotating the connecting bar, and the dumbbell plates are detachably connected to limiting parts capable of limiting the rotation of the connecting bar.
 2. The dumbbell according to claim 1, wherein the notch has a shape of stripe, and the notch is extending to a center of the dumbbell plate, notches of the dumbbell plates of the same side are aligned with each other, a cross-sectional shape of the notch perpendicular to the dumbbell plate is arc shaped, the slot has an arc shaped opening facing to the notch, and an arc of the slot has a radius of curvature as same as the radius of the connecting bar, and the axis of the connecting bar is arranged co-axially with the inner circumferential surface of the slot, each of the fasteners comprises a flat groove defined at a outer circumferential surface of the connecting bar, the flat groove is extending along the axis of the connecting bar to an end surface facing a middle part of the connecting bar of a dumbbell plate nearest to the middle part of the connecting bar, the flat grooves of fasteners at the same end are in communication with each other, the outer circumferential surface of the connecting bar facing the dumbbell plates forms connecting parts with openings of the flat grooves, the connecting parts are capable of fastening to the slots, and the connecting parts of the connecting bar depart from the inner walls of the slots while the flat grooves are facing the slots.
 3. The dumbbell according to claim 2, wherein an angle of two ends of the slot along the arc direction with respect to the center thereof is equal to an angle of two edges of the flat groove along the circumferential direction of the connecting bar about the axis thereof, and a product of the angle of two edges of the flat groove along the circumferential direction of the connecting bar about the axis thereof and a number of the dumbbell plates at the same side is less than 360 degree.
 4. The dumbbell according to claim 2, wherein the slots facing each other of the dumbbell plates at the same side forms a inserting groove, both ends of the connecting bar are rotatably connected to a hollow inserting plate inserted to inserting groove, a thin wall of the hollow inserting plate has elasticity and toughness, all of the flat grooves at the same side of the connecting bar are provided in the hollow inserting plate, and a stopper detachably connected to the supporting base is provided on the hollow inserting plate.
 5. The dumbbell according to claim 4, wherein both axial end of the hollow inserting plate along the connecting bar are connected to a hollow cover, and the connecting bar is rotatably connected to the hollow covers.
 6. The dumbbell according to claim 4, wherein the stopper comprises a limiting disk connected to the hollow inserting plate, a plurality of limiting notches are defined on a peripheral of the limiting disk, and a positioning block capable of inserting into the positioning notches is extruded from the top surface of the supporting base.
 7. The dumbbell according to claim 4, wherein a mounting groove is defined on the end surface of the hollow inserting plate away from the inserting groove, a plurality of through holes corresponding to the dumbbell plates are defined on an inner bottom surface of the mounting groove, a main magnet plate is fixed to the inner bottom surface of the mounting groove, and a plurality of straight holes corresponding to the plurality of through holes are extended through the main magnet plate; the limiting part comprises a mounting plate inserting to the mounting groove, and a plurality of connecting grooves corresponding to the through holes are defined on an end face of the mounting plate facing the inner bottom surface of the mounting groove, the end face of the mounting plate facing the inner bottom surface of the mounting groove is fixed to a sub magnet plate, a plurality of through grooves corresponding to the connecting grooves are extended through the sub magnet plate, a spring is fixed on the inner bottom surface of each of the connecting grooves, and an abutting block is fixed to an end of the spring away from the mounting plate, and the abutting block and the spring are both extending through the straight hole and the through hole; the abutting block is firmly abutted to at least one of the flat grooves via the spring while the connecting bar is fastened into the slots via the connecting parts.
 8. The dumbbell according to claim 7, wherein a plurality of threaded holes in communication with the plurality of connecting grooves are extending through the mounting plate, each of the threaded holes is connected with a threaded rod, and the threaded rod is extending through the spring and abuts to the abutting block.
 9. The dumbbell according to claim 1, a plurality of separating grooves capable of inserting the dumbbell plates are defined on the receiving groove of the supporting base arranged along the axial direction, a peripheral surface of each of dumbbell plates is provided with a section, and the dumbbell plates abut to an inner bottom surface of each of the separating grooves via the sections.
 10. A method of using a dumbbell according to the dumbbell according to claim 1, comprising: step 1: placing the plurality of dumbbell plates into the separating grooves of the supporting base, abutting to the inner bottom surface of the separating grooves via the sections of the dumbbell plates, the notches are all upward placed, and all of the slots of the adjacent dumbbell plates are aligned with each other, then inserting the hollow inserting plates on both ends of the connecting bar into the inserting groove formed by the slots of the plurality of dumbbell plates at the same side, at the same time, inserting positioning blocks of the supporting base into the limiting notches of the limiting disk; step 2: remaining the hollow inserting plate, the dumbbell plates, and the supporting base in a relatively stable state, then rotating the connecting bar, such that the plurality of connecting parts sequentially inserting into the thin walls of the hollow inserting plate and fastening into the slots, then stop rotating the connecting bar if the required number of the fastened dumbbell plates is reached; and step 3: inserting the plurality of abutting blocks and the springs into the through holes, and the sub magnet plate of the mounting plate is attaching to the main magnet plate in the inner bottom surface of the mounting groove, wherein the abutting blocks at one end of the connecting bar firmly abut to at least one flat grooves via the springs, then connecting the threaded rods to the threaded holes, the threaded rods abutting to the abutting blocks after extending the springs, thereby limiting the movement of the abutting blocks. 